The invention relates to implement method and system of a four-dimensional electrocardiogram diagnostic apparatus. The implement system of the four-dimensional electrocardiogram diagnostic apparatus comprises an equipment interface module, a signal acquisition processing module, an electrocardiogram signal filtering module, an electrocardiogram acquisition display module, an archive file management module, a comprehensive electrocardiogram display module, a two-dimensional electrocardiogram display module, a three-dimensional electrocardiogram display module, a teaching demonstration module, a diagnosis report printing module, an electrocardio-parameter extraction module, an automatic diagnosis module, an automatic electrocardio-identification module, a user operation interface module anda software safety management module. The implement system of the four-dimensional electrocardiogram diagnostic apparatus provides a 12 lead ECG (Electrocardiogram), an O-ECG (Orthogonal Electrocardiogram), a zV-ECG (Vector Electrocardiogram ), a T-VCG (Time Vectorcardiogram), a DCT-VCG (Turnaround Time Vectorcardiogram), a C-VCG (Continuous Vectorcardiogram), a D/A VCG (Decomposed/Amplified Vectorcardiogram), a VCG (Plane Vectorcardiogram), a 3D-VCG (Three-dimensional Vectorcardiogram), a 3DI-VCG (Three-dimensional Image Vectorcardiogram) and an electrocardiac activity diagram; and in addition, a diagnostic report adopts the ways of characters, report forms and images.